BUG chdir to correct dir when building docs.
BUG chdir to correct dir when building docs.

sketchytechky/pyfolio,raybuhr/pyfolio,quantopian/pyfolio,r0k3/pyfolio,yanheven/pyfolio,femtotrader/pyfolio,quantopian/pyfolio,femtotrader/pyfolio,YihaoLu/pyfolio,dursk/pyfolio,ChinaQuants/pyfolio,ChinaQuants/pyfolio,sketchytechky/pyfolio,r0k3/pyfolio,YihaoLu/pyfolio,yanheven/pyfolio,raybuhr/pyfolio,chayapan/pyfolio,dursk/pyfolio